In the middle and the lower courses

The rivers which water throughout the year is termed as perennial river.These rivers receive water from rain as well from melted snow from the lofty mountains.
Examples: The Ganga,the Indus,the Brahmaputra ,etc

(i) Before entering India, the river carries a small volume of water and less silt because Tibet is a cold and dry area.
(ii) But After entering India, it passes through a region of high rainfall.
The river carries a considerable amount of water and silt and hence become a big river.

In Arunachal Pradesh through a gorge.

River Brahmaputra.

The river Brahmaputra arises in Tibet and very close to the sources of the Indus and the Satluj.

Dendritic

Any elevated area like a mountain or an upland that separates two drainage basin is as water divide.

(i) Water Divide: Any elevated area like a mountain or an upland, that separates two drainage basin in termed as water divide
(ii) Example: Ambala-Saharanpur upland between the river Indus and the Ganga river system.
(iii) Ambala is located on the water divide between the Indus and the Ganga river systems.
(iv) The plain from Ambala to the Sunderban stretch over nearly 1800 km,but there is a fall one metre for every 6 km.
Hence the river develops large meanders.

The Himalayan River Systems
(i) Major Himalayan rivers are the Indus, the Ganga and the Brahmaputra.
(ii) Because of their length, long distance flow, and numerous large and important tributaries; they may be called river systems.

(i)  The Indus river system
(ii) The Ganga river system
(iii)The Brahmaputra river system.

Two Peninsular rivers flowing in troughs:
(a)Narmada
(b)Tapi(Tapti)

The Brahmaputra in its Tibet part has silt because of hard terrain and steep slope.

A water divide means the upland which divides the two drainage basins from each other.
Example: Ambala-Saharnpur upland seperates the Indus Basin from the Ganga Basin

Comparison between East flowering and West flowering rivers of the Peninsular Plateau.